Fair Value Measurements (Details) (USD $)	3 Months Ended	12 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Liabilities
Amount transferred from Level 1 to Level 2	$ 0	$ 0
Amount transferred from Level 2 to Level 1	0	0
Amount transferred from Level 1 to Level 2	0	0
Amount transferred from Level 2 to Level 1	0	0
Amount transferred into Level 3	0	0
Amount transferred out of Level 3	0	0
Amount transferred into Level 3	0	0
Amount transferred out of Level 3	0	0
Recurring \| Measured at fair value
Assets
Cash and cash equivalents	33,301,000	37,495,000
Liabilities
Warrant liability	12,949,000	11,286,000
Recurring \| Measured at fair value \| Quoted prices in active markets (Level 1)
Assets
Cash and cash equivalents	33,301,000	37,495,000
Recurring \| Measured at fair value \| Significant unobservable inputs (Level 3)
Liabilities
Warrant liability	$ 12,949,000	$ 11,286,000

It represents aggregate fair value of warrants.

No definition available.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016

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Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

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Amount of transfers of liabilities measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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Amount of transfers of liabilities measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

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Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(3)

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Amount of transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy.

+ References

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-Publisher FASB

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Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

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Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

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